Vol. 1, No.1 (2000)

By | July 26, 2014

Titles of research papers/articles published in ROC Vol. 1, No. 1, 2000. For full text, please contact to Editor-in-Chief at info@cropresearch.org.


1. R. BALASUBRAMANIAN AND J. KRISHNARAJAN [Influence of irrigation regimes on growth, water use and water use efficiency of direct seeded rice]. Res. on Crops 1 (1) : 1-4 (2000). Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore-641 003, India.

ABSTRACT

Field experiments were conducted at the Agricultural College and Research Institute, Coimbatore for two seasons (kharif 1997 and rabi 1997 ) to study the effect of different water management practices on growth, water use and water use efficiency of direct seeded rice. The results revealed that continuous submergence of 2.5 cm throughout the crop period resulted in enhancement of growth characters and this treatment saved nearly 25% of irrigation water when compared to application of 5 cm depth one day after disappearance of ponded water for transplanted rice. The same treatment also resulted in higher water use efficiency.

2. R. M. Sirohi, A. Yadav and R. K. Malik [Effect of pendimethalin alone or in mixture with isoproturon or sulfosulfuron on Phalaris minor Retz. density and yield of wheat]. Res. on Crops 1 (1) : 5-8 (2000). Department of Agronomy, CCS Haryana Agricultural University, Hisar-125 004, India.

ABSTRACT

Field experiments were conducted during the winter seasons of 1997-98 and 1998-99 to evaluate the efficacy of pendimethalin and sulfosulfuron alone and tank mix of pendimethalin with isoproturon (1 : 1) or pendimethalin with sulfosulfuron (50 : 1) on Phalaris minor density and grain yield of wheat. Pendimethalin alone at 1.25 kg ha-1 applied pre-seeding and pre-emergence was more effective against P. minor compared to its lower doses or its application at 15 days after sowing. Application of pendimethalin as tank mixture with isoproturon (1 : 1) or sulfosulfuron (50 : 1) was more effective compared to pendimethalin applied alone. Sulfosulfuron based mixture was more effective as compared to isoproturon based mixture. Pendimethalin alone at 1.25 kg ha-1 applied pre-seeding and pre-emergence and in combination with sulfosulfuron and sulfosulfuron applied alone allowed a sugnificant increase in grain yield of wheat compared to weedy check.

3. M. P. DUBEY [Study on economic viability and sustainability of different rabi crops under rainfed conditions]. Res. on Crops 1 (1) : 9-11 (2000). J. N. K. V. V. Regional Agricultural Research Station, Sagar-470 002 (M. P.), India

ABSTRACT

Field experiments were conducted during winter season for two consecutive years of 1993-94 and 1994-95 at JNKVV Regional Agricultural Research Station, Sagar (M. P.) on clay soils to evaluate different rabi crops for economic viability and sustainability under rainfed conditions. Present trial was arranged in RBD replicated four times with seven crops considering as treatments. The results revealed that in the first year of experimentation (1993-94), five crops viz., linseed (Linum usitatissimum L.), safflower (Carthamus tinctorius L.), mustard (Brassica juncea L.), gram (Cicer arietinum L.) and pea (Pisum sativum L.) produced higher yields than the second year (1994-95), while lentil (Lens culinaris Medik.) and wheat [Triticum aestivum (L.) emend. Fiori and Paol.] behaved vice-versa. Amongst various crops, lentil produced the highest yield of 14.57 q/ha followed by wheat (12.89 q/ha). Similarly, lentil produced significantly the highest wheat equivalent yield (25.75 q/ha) and earned the maximum gross as well as net monetary returns (Rs. 14253 and 10716, respectively) and proved the most profitable crop (B : C ratio = 4.01 : 1.00) of this region under rainfed conditions. Wheat and gram occupied second and third place, respectively, in terms of economic gains, while mustard crop was found the worst (B : C ratio=1.18 : 1.00) among all under the agroclimatic conditions of Sagar region of Madhya Pradesh for rainfed cultivation during the study period.

4. J. R. FERNANDEZ SOLIS, R. K. MAITI, RAHIM FOROUGHBAKHCH1 AND S. MARTíNEZ-LOZANO [Genotypic variability among maize hybrids (Zea mays L.) for resistance to drought, salinity and high temperature at the seedling stage]. Res. on Crops 1 (1) : 12-19 (2000). Universidad de las Americas, Departamento de Quimica y Biologia, Santa Catarina Martir, C. P.72820, Puebla, Mexico

ABSTRACT

Maize hybrids showed genotypic variability in resistance to drought, salinity and high temperature at the seedling stage, thereby giving an opportunity for the selection for resistance to particular stress. Root was highly sensitive to salinity. Some hybrids were tolerant to drought and salinity. The hybrids showed better growth under 380C and some also to drought. Only a few genotypes were moderately tolerant to salinity.

5. S. MORENO LIMóN, R. K. MAITI1, ADRIANA NUñEZ GONZáLEZ, R. FOROUGHBAKhCH, JULIA VERDE STAR, HILDA GAMEZ GONZALEZ AND GRACIELA GARCIA DíaZ [Differential responses of two bean cultivars (Phaseolus vulgaris L.) resistant and susceptible to water stress in seedling growth and mineral uptake]. Res. on Crops 1 (1) : 20-24 (2000). Postgraduate Division, Facultad de Ciencias Biologicas, Universidad Autonoma de Nuevo Leon, Apartado Postal F-16, C. P. 66450, San Nicolas de los Garza, N. L., Mexico

ABSTRACT

The paper reported differential responses of bean cultivars resistant and susceptible in seedling growth and mineral accumulation of mineral contents. Highly significant differences were observed among genotypes and water stress treatments in the accumulation of minerals in stems, leaves and roots. Under water stress, resistant cultivars showed better seedling growth and higher accumulation of minerals acting as osmotic adjustment under water stress.

6. S. MORENO LIMóN, R. K. MAITI1, ADRIANA NUñEZ GONZáLEZ, JULIA VERDE STAR AND HILDA GAMEZ GONZALEZ [Biochemical mechanism in bean cultivars (Phaseolus vulgaris L.) for resistance to salinity stress at the germination stage]. Res. on Crops 1 (1) : 25-33 (2000) Postgraduate Division, Facultad de Ciencias Biologicas, Universidad Autonoma de Nuevo Leon, Apartado Postal F-16, C. P. 66450, San Nicolas de los Garza, N. L., Mexico

ABSTRACT

In this study, six improved and six commercial bean cultivars were evaluated separately to determine the genotypic variability and biochemical mechanism of resistance to salinity at the germination stage. Wide genotypic variability existed among cultivars for tolerance to salinity also in the accumulation of sugars, proteins and mineral elements. Tolerant genotypes accumulated additional sugars, and a higher amount of protein and mineral contents, which function as osmotic adjustment and high energetic materials for offering resistance mechanism to salinity. A higher acquisition of minerals of Na ions and other mineral elements acted as a mechanism of resistance to salinity as has been reported in some other crops.

7. P. LOGANATHAN1, K. SARAVANAN AND J. GANESAN [Genetic analysis of yield and related components in greengram (Vigna radiata L.)]. Res. on Crops 1 (1) : 34-36 (2000). Department of Agricultural Botany, Annamalai University, Annamalainagar-608 002, India

ABSTRACT

Genetic parameters were estimated for some metric characters from the data of a diallel cross involving seven diverse parents of greengram (Vigna radiata L.). The analysis revealed the presence of both additive and non-additive gene effects. Over dominance was involved for days to first flower, plant height, number of branches per plant, number of clusters per plant, number of pods per cluster, number of pods per plant, pod length and seed yield per plant. However, partial dominance was recorded for 100-seed weight. The preponderance of dominant genes was observed for expression of plant height and number of pods per plant. The heritability estimates were of moderate to high magnitude for all the characters except for plant height, number of clusters per plant and seed yield per plant.

8. SERENE MARAGATHAM ISAACS, S. JEBARAJ AND S. K. GANESH [Estimates of genetic variability and heritability in blackgram [Vigna mungo (L.) Hepper]. Res. on Crops 1 (1) : 37-39 (2000). Department of Agricultural Botany, Agricultural College and Research Institute, Madurai-625 104, India

ABSTRACT

Thirty-two blackgram genotypes of diverse origin were studied for phenotypic and genotypic coefficients of variability, heritability and genetic advance. Sufficient variability was present among the population for most of the characters studied. High heritability values associated with high genetic advance were obtained for single plant yield, pods per plant and other yield attributing traits, except for number of seeds per pod. High heritability with medium genetic advance was obtained for 100-seed weight. Hence, yield improvement in blackgram would be achieved through selection for the above characters.

9. A. CHETIA, I. BORUA AND C. R. SARKAR [Nutritional and antinutritional factors of a few improved varieties of field bean (Dolichos lablab L.) seeds]. Res. on Crops 1 (1) : 40-44 (2000). Department of Biochemistry and Agricultural Chemistry, Assam Agricultural University, Jorhat-785 013 (Assam), India

ABSTRACT

Mature seeds of five improved cultivars of field bean (Dolichos lablab L.) were analysed for nutritional and antinutritional factors. The cultivars showed considerable variation in their composition. On a dry matter basis, the percentage of crude protein varied from 22.06 to 28.34, crude fat 1.62 to 2.22, crude fibre 6.02 to 10.63 and total carbohydrate 57.51 to 64.70. The amounts (mg/100 g) of calcium, phosphorus, iron, sodium and potassium ranged from 28 to 48, 330 to 415, 5.60 to 6.94, 0.482 to 0.684 and 10 to 15, respectively. Among antinutritional factors, seeds contained high level of TIA (8350 to 8800 TIU g-1) on dry matter basis. Phytic acid, tannin and hydrocyanic acid varied from 671.50 to 802.52, 925 to 2025 and 32.4 to 46.9 mg/100 g, respectively.

10. GHAZI N. AL-KARAKI [Pod yield and chemical composition of wild legume (Tetragonolobus palaestinus) populations]. Res. on Crops 1 (1) : 45-49 (2000). Faculty of Agriculture, Jordan University of Science and Technology, P. O. Box 3030, Irbid, Jordan

ABSTRACT

Tetragonolobus palaestinus Bioss is a wild grain legume species, which grows naturally on the plains and hilly areas of north Jordan and neighbouring countries. In a study of green pod yield and chemical composition traits of wild populations of T. palaestinus at two locations, the following variables were determined : pod yield and pod concentrations of protein, lipid, glucose, fructose, sucrose and starch. Significant correlations between four pairs of variables were noted. The wild populations of T. palaestinus reported in this study appeared to be homogenous, although some of the observed variations could have arisen from variations of the environmental conditions among locations.

11. RANJAN KUMAR SAHOO, ABDUL KHALAK, G. M. SUJITH AND R. A. SHERIFF1 [Influence of spacing regimes and nitrogen levels on yield and quality of mustard cultivars]. Res. on Crops 1 (1) : 50-54 (2000). Department of Agronomy, University of Agricultural Sciences, Bangalore-560 065, India

ABSTRACT

An experiment was conducted during the years 1998 and 1999 to study the effect of spacing regimes and nitrogen levels on seed yield and quality parameters of mustard cultivars. The data revealed that Chikkaballapur local produced higher seed yield (836.44 kg ha-1) and oil yield (262.14 kg ha-1). The oil and protein contents were highest for RH-30 and at closer spacing, while the oil and protein yields were highest in Chikkaballapur local cultivar. Increased dosage of introgen decreased the oil content but increased oil yield, while both protein content and protein yield increased significantly.

12. K. SUBRAHMANIYAN, P. KALAISELVEN AND N. ARULMOZHI [Evaluation of different phosphorus solubilizing microorganisms in groundnut (Arachis hypogaea L.)]. Res. on Crops 1 (1) : 55-57 (2000). T. N. A. U. Regional Research Station, Vridhachalam-606 001, India

ABSTRACT

A field experiment was conducted during rabi 1996-97 to 1998-99 to study the performance of different phosphorus solubilizing microorganisms (PSM) on the root nodulation, dry weight of root nodules, yield attributes and yield of groundnut. Among the different phosphorus solubilizing microorganisms tried, Bacillus polymyxa significantly produced the maximum number of root nodules/plant, dry weight of root nodules/plant, number of matured pods/plant, 100-kernel weight (g), shelling (%) and a pod yield of 2148 kg ha-1.

13. S. KUMAR, V. SWAMINATHAN AND S. SATHIAMOORTHY [Effect of spacing, nutrition and intercrops on yield and quality of papaya (Carica papaya L.)]. Res. on Crops 1 (1) : 58-62 (2000). Department of Pomology, Tamil Nadu Agricultural University, Coimbatore-641 003, India

ABSTRACT

Experiments were conducted for three years with the combinations of spacings, nutrients and intercrops, to study the effect of fruit yield per plant and quality of papaya cv. 9-1 (D). Growing tomato as intercrop, with 25% increased fertilizer level i. e. 62.5 g each of NPK/plant dose in the widest spacing of 2.1 x 2.1 m recorded the highest yield of papaya (170.36 and 99.77 kg of fruit/tree). These treatments had little or no significant effects on quality parameters of papaya.

14. Y. M. SOMASEKHARA, S. Y. WALI1 AND A. N. BAGALI [Ceratocystis fimbriata_A threatening pathogen of pomegranate (Punica granatum Linn.) in northern Karnataka]. Res. on Crops 1 (1) : 63-66 (2000). Department of Plant Pathology, College of Agriculture, Bijapur-586 101 (Karnataka), India

ABSTRACT

Pomegranate (Punica granatum Linn.) is one of the important fruit crops in Bijapur, Karnataka. At present, the crop is severely affected by wilt pathogen and day by day the wilting severity is increasing at faster rate. 6,745 plants were wilted out of 54,866 plants surveyed in 128 locations and caused monitor loss about Rs. 67.45 lakhs during 1996-99. The fungus, Ceratocystis fimbriata isolated from the brown discoloured parts viz., stem, root and branches of the wilted plants was collected from Bagalkot, Bijapur, Bilagi, Kanamadi, Tikota, Sindagi, Indi, Talikoti and Tajpur locations. Pathogenicity of this fungus was proved by artificial inoculation through wounded roots in August 1997. The fungus, C. fimbriata was isolated from the scolytid beetles, Xyleborus fornicatus Eichh. on potato dextrose agar medium. Pomegranate wilt is a burning problem in northern Karnataka and it may become epiphytotic condition within a short period.

15. M. MADHAN MOHAN, S. M. IBRAHIM AND S. LAKSHMI NARAYANAN [Rooting of rose micro-shoots]. Res. on Crops 1 (1) : 67-70 (2000). Tissue Culture Unit, Department of Agricultural Botany, Agricultural College and Research Institute, Madurai-625 104, India

ABSTRACT

The present investigation was carried out with three rose varieties viz., white rose with pink tinch (Rosa sp.), Edward rose (Rosa borbanica) and Andhra red rose (Rosa centifolia). The effect of growth regulators viz., NAA, IAA and IBA was studied individually and in combination with different concentrations for rooting through statistical analysis in factorial completely randomized design (FCRD). The highest percentage of rooting of micro-shoots was obtained in ¼ MS medium supplemented with 1.5 mg l-1 IAA+1.5 mg l-1 NAA+1.0 mg l-1 IBA irrespective of varieties tested.

16. M. MADHAN MOHAN AND S. M. IBRAHIM [Callus induction from leaf bit explants of rose]. Res. on Crops 1 (1) : 71-73 (2000). Tissue Culture Unit, Department of Agricultural Botany, Agricultural College and Research Institute, Madurai-625 104, India

ABSTRACT

An investigation was carried out with three rose varieties viz., white rose with pink tinch (Rosa sp.), Edward rose (Rosa borbanica) and Andhra red rose (Rosa centifolia). The effect of growth regulators viz., 2, 4-D and BA was studied individually and in combination with different concentrations for callus induction from leaf bit explants through statistical analysis in factorial completely randomized design (FCRD). The highest percentage of callus induction was obtained in MS medium supplemented with 2.0 mg l-1 2, 4-D+0.2 mg l-1 BA irrespective of varieties tested.

17. J. BAGE, P. GHANTI, A. R. MANDAL AND N. C. PARIA [Effect of organic manures on growth and yield of pumpkin [Cucurbita moschata (Duch.) Poir]. Res. on Crops 1 (1) : 74-78 (2000). Department of Vegetable Crops, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741 252, Nadia (W. B.), India

ABSTRACT

An experiment was conducted at Horticultural Research Station, Mondouri of Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal during the period from October 1997 to February 1998 to identify the efficacy of four organic manures (surja, mahua cake, mustard cake and cowdung manure) on growth and yield of pumpkin. Each manure was applied at four different doses (0, 1000, 2000 and 3000 kg/ha) alongwith a constant dose of N (as urea) @ 38.33 kg/ha. It was found that mustard cake recorded superior performance in relation to vegetative growth, fruit number, fruit weight and fruit yield (99.53 q/ha). First female flower opened on the lowest number of node under the influence of cowdung manure. Biometric characters influenced favourably with the application of 3000 kg manure/ha except fruit yield and it was maximum (96.20 q/ha) under 2000 kg manure/ha. Effect of interaction revealed that mustard cake @ 3000 kg/ha registered highest fruit yield of 133.33 q/ha.

18. SANJAY CHADHA, JAGMOHAN AND VIDYASAGAR [Studies on the heterotic response in tomato (Lycopersicon esculentum Mill.) under mid and low hill conditions of Himachal Pradesh]. Res. on Crops 1 (1) : 79-84 (2000). Department of Vegetable Science and Floriculture, Himachal Pradesh Krishi Vishvavidyalaya, Palampur-176 062 (H. P.), India

ABSTRACT

The heterotic response of F1 population of 40 crosses of tomato developed in line (10) x tester (4) mating system was determined over the best parent under mid (Bajaura) and low (Akrot) hill conditions of Himachal Pradesh. Four crosses at Bajaura and two at Akrot revealed significantly higher marketable fruit yield over the best parent Solangola which is a commercial cultivar of Himachal Pradesh. The cross combination Hisar Arun x solangola recorded the highest heterosis percentage over the best parent at both the locations. Pusa Sheetal x Sioux at Bajaura and Hisar Arun x Sioux at Akrot were also found promising.

19. LAXMAN SINGH AND B. PAL [Effect of water salinity and fertility levels on yield and yield attributing characters of blonde psyllium (Plantago ovata Forsk)]. Res. on Crops 1 (1) : 85-90 (2000). Krishi Bhawan Jodhpur-342 006 (Rajasthan), India

ABSTRACT

The micro-plot experiment was conducted for two years continuously during rabi season at Research Farm, Bichpuri, Agra to evaluate the performance of blonde psyllium in two types of saline water having salinity levels : E1 (ECiw 2.4 dSm-1); E2 (ECiw 12 dSm-1) and five levels of fertility : F1 (control), F2 (50 kg N+25 kg P2O5 ha-1), F3 (50 kg N+25 kg P2O5+25 kg K2O), F4 (50 kg N+25 kg P2O5+20 kg ZnSO4) and F5 (50 kg N+25 kg P2O5+25 kg K2O+20 kg ZnSO4 ha-1). Pooled data of two seasons revealed that water salinity ECiw 12 dSm-1 significantly decreased the ear length, number of grains/ear and 1000-grain weight (g), grain, husk and straw yield as compared to salinity control (ECiw 2.4 dSm-1). The interaction effect of fertility and salinity results showed that application of ECiw 12 dSm-1 decreased the grain yield by 28.60, 32.29, 29.37, 31.22 and 27.56%; husk yield by 27.94, 31.40, 28.41, 30.17 and 26.45% in F1, F2, F3, F4 and F5 fertility levels, respectively, as compared to control (ECiw 2.4 dSm-1). At ECiw 12 dSm-1, the fertility levels F2, F3, F4 and F5 enhanced the grain yield by 52.56, 80.30, 63.69 and 103.42%; husk yield by 53.06, 81.63, 65.30 and 106.12% and straw yield by 24.85, 48.74, 37.40 and 55.02% as compared to control F1. The order of the superiority of treatments was F5 > F3 > F4 > F2 > F1 for yield and yield attributes.

20. T. GOHAIN, A. C. BARBORA AND A. DEKA[Effect of manganese on growth, yield and quality of tea [Camellia sinensis L. (O) Kuntez]. Res. on Crops 1 (1) : 91-97 (2000). Department of Agronomy, Tocklai Experimental Station, Tea Research Association, Jorhat-785 008 (Assam), India

ABSTRACT

To study the effect of different levels of manganese (Mn) on growth, yield and quality of tea, an experiment was conducted during 1994 to 1996 at Tocklai Tea Estate of Tocklai Experimental Station, TRA, Jorhat, Assam with four levels of Mn (0, 5, 10 and 15 kg Mn/ha/year). Manganese showed significant influence on yield of tea recording the highest yield at 10 kg Mn/ha/year. A positive response was observed due to manganese and quality of tea, though statistically it was not significant. It was observed that all the quality parameters viz., TF, TR, brightness, total colour and caffeine content increased over control with the increase in the levels of Mn. Manganese application positively affected uptake of leaf N and P. With the increase in levels of Mn, the shoot Mn content also significantly increased.

21. P. S. SENTHIL KUMAR AND K. KUMARASWAMY [Effect of manure-fertilizer schedules on soil properties and different forms of potassium in a permanent manurial experiment]. Res. on Crops 1 (1) : 98-104 (2000). Department of Soil Science and Agricultural Chemistr, Agricultural College and Research Institute, Madurai-625 104, India

ABSTRACT

A permanent manurial experiment under rice monoculture is being conducted at the Agricultural College and Research Institute, Madurai since 1975. The present study was conducted to evaluate the changes in certain soil properties and the forms of K in soil as influenced by the different manure-fertilizer schedules adopted since 1975 in the experiment. The soil salinity and soil reaction had not changed significantly due to adoption of different manure-fertilizer schedules over the years since 1975. Organic carbon and CEC of the soil were higher in the treatment receiving one of the organic manures of farm yard manure (FYM) or green manure (GM) or urban compost (UC) and nitrogen with or without phosphorus and K. The total, available, water-soluble, exchangeable and non-exchangeable K status had increased in the treatments that received any one of the organic manures and K through fertilizer.

22. A. K. SHARMA, A. K. KELKAR, O. R. MISRA, S. S. KUSHWAHA AND A. M. RAJPUT [Response of wheat (Triticum durum) to integrated nutrient management under irrigated conditions]. Res. on Crops 1 (1) : 105-107 (2000). JNKVV College of Agriculture, Indore-452 001 (M. P.), India

ABSTRACT

A field experiment was conducted on durum wheat under irrigated conditions to study the interaction effect of organic manures/biofertilizers and chemical fertilizers at various fertility levels. Findings indicated that higher fertility levels undoubtedly gave better grain yield than lower levels of fertility. Among different sources of organics, although higher values of grain yield were noted under FYM and poultry manure, but the use of biofertilizer was found to be best from economic point of view. However, the highest grain yield was noted due to 125% recommended dose of chemical fertilizers and FYM interaction.

23. MUHAMMAD BASHEERUDDIN, K. HUSSAIN SAHIB, GOVINDA RAO, BHATTIPROLU AND S. S. RAO [Association of grain yield with different phases of reproductive period in sorghum]. Res. on Crops 1 (1) : 108-110 (2000). Regional Agricultural Research Station, Palem-509 215 (A. P.), India

ABSTRACT

Studies on correlation coefficient and path analysis were conducted in 15 sorghum varieties encompassing different reproductive phases and grain yield. The grain yield was found to be positively correlated with days from flowering to grain formation initiation, days from flowering to physiological maturity and 100-seed weight, and negatively correlated with days to flowering, days from grain formation initiation to physiological maturity and days from sowing to physiological maturity.

24. P. OUDHIA AND R. S. TRIPATHI [Allelopathic effects of an obnoxious weed parthenium hysterophorus L. on germination and seedling vigour of rice var. Mahamaya]. Res. on Crops 1 (1) : 111-115 (2000). Department of Agronomy, Indira Gandhi Agricultural University, Raipur-492 001, India

ABSTRACT

Allelopathic effects of an obnoxious weed Parthenium hysterophorus L. on germination were investigated. Root, stem, leaf and stem+leaf of Parthenium were cut into fine pieces, immersed in water and decayed for 120, 168, 216 and 264 h at room temperature (22±0C) in the ratio of 1 : 10 (w/v). The extracts were applied on rice seeds. The extracts of different parts of Parthenium produced significant allelopathic effects on germination and seedling vigour of rice. At 11 days after sowing (DAS), stem extract of 216 h and stem+leaf extract of 120 h resulted in maximum and minimum germination, respectively. Stem extract of 216 h was identified as promising extract in order to stimulate the early germination and seedling vigour of rice var. Mahamaya.

25. P. OUDHIA [Positive (inhibitory) allelopathic effects of some obnoxious weeds on germination and seedling vigour of pigeonpea (cajanus cajan L.)]. Res. on Crops 1 (1) : 116-118 (2000). Department of Agronomy, Indira Gandhi Agricultural University, Raipur-492 001, India

ABSTRACT

Due to non-availability of any information on allelopathic effects of aqueous extracts of Parthenium hysterophorus, Lantana camara and jatropha curcas on germination and seedling vigour of pigeonpea, a pot culture study was conducted during 1999-2000. To prepare extracts, the crushed leaves were allowed to decay for 24 h in distilled water in different ratio of 1 : 10 and 1 : 15 w/v (weed material : water). Pigeonpea seeds were soaked in extracts for 24 h. Different extracts produced significant positive (inhibitory) allelopathic effects of germination and seedling vigour of pigeonpea.

26. P. OUDHIA AND R. S. TRIPATHI [Allelopathic effects of some plant extracts on rice var. Mahamaya]. Res. on Crops 1 (1) : 119-121 (2000). Department of Agronomy, Indira Gandhi Agricultural University, Raipur-492 001, India

ABSTRACT

Allelopathic effects of Sesamum indicum, Helianthus annuus, Catharanthus rosea, Bombax ceiba and Acacia auriculaeformis on germination and seedling vigour of rice var. Mahamaya were investigated. the fresh samples of leaves of these plants were cut into fine pieces, immersed in water and decayed for 24 h in the ratio of 1 : 10 (w/v). The extracts were applied on rice seeds. Different extracts produced significant effect on germination and seedling vigour of rice var. Mahamaya. At 11 days after sowing (DAS), sesamum leaf extract produced maximum root and shoot elongation without affecting the germination.